Comparison of Photodegradation Performance of 1,1,1-Trichloroethane in Aqueous Solution with the Addition of H2O2 or S2O82– Oxidants

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State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China
Shanghai Academy of Environmental Science, Shanghai 200233, China
*Tel.: +86 21 64250709. Fax: +86 21 64252737. E-mail: [email protected]
Cite this: Ind. Eng. Chem. Res. 2012, 51, 21, 7196–7204
Publication Date (Web):May 7, 2012
Copyright © 2012 American Chemical Society
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The chemical oxidation of 1,1,1-trichloroethane (TCA), a widely detected groundwater pollutant, by UV/H2O2 and UV/S2O82– processes was investigated. The effects of various factors were evaluated, including peroxide/TCA molar ratio, solution pH, Cl and HCO3 anions, and humic acid (HA). The results showed that TCA oxidation fit to a pseudo-first-order kinetic model. The optimum H2O2/TCA molar ratio was 5:1, with TCA removal of 54.2% in 60 min. In the UV/S2O82– process, higher molar ratios (from 1/1 to 10/1) resulted in higher TCA oxidation rates, and TCA could be completely removed after 60 min with a S2O82–/TCA molar ratio of 3/1. In addition, acidic conditions were favorable for TCA removal in the UV/S2O82– process, while maximum TCA removal was observed at pH 6 in the UV/H2O2 process. Both Cl and HCO3 anions adversely affected TCA oxidation performance, and higher concentration of HA resulted in a lag phase for TCA oxidation in both processes. Several reaction intermediates, including 1,1,1,2-tetrachloroethane, carbon tetrachloride, chloroform, tetrachloroethylene, 1,1-dichloroethylene, and tri- and dichloroacetic acids, were first identified during TCA oxidation by S2O82– chemistry, while only monochloroacetic acid was detected in the UV/H2O2 process. The results indicated that the UV/S2O82– process was much more effective than the UV/H2O2 process, but the latter was more environmentally friendly because fewer toxic intermediates were produced.

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